Mexican-Americans had higher testosterone than whites but similar estradiol and SHBG concentrations. However, blacks had higher estradiol levels. Non-Hispanic blacks (36.49 nmol/liter) had a higher SHBG concentration than non-Hispanic whites (34.91 nmol/liter P < 0.05) and Mexican-Americans (35.04 nmol/liter P < 0.05).Ĭonclusions: Contrary to the postulated racial difference, testosterone concentrations did not differ notably between black and white men.
Non-Hispanic blacks (40.80 pg/ml) had a higher estradiol concentration than non-Hispanic whites (35.46 pg/ml P < 0.01) and Mexican-Americans (34.11 pg/ml P < 0.01). Results: After applying sampling weights and adjusting for age, percent body fat, alcohol, smoking, and activity, testosterone concentrations were not different between non-Hispanic blacks (n = 363 geometric mean, 5.29 ng/ml) and non-Hispanic whites (n = 674 5.11 ng/ml P > 0.05) but were higher in Mexican-Americans (n = 376 5.48 ng/ml P < 0.05).
Measurement: Serum hormone concentrations were measured by electrochemiluminescence immunoassays. Participants, Design, and Setting: A total of 1413 men aged 20+ yr and who attended the morning examination session of the Third National Health and Nutrition Examination Survey (NHANES III) in 1988–1991 were included in this cross-sectional study. Objective: Our objective was to compare serum testosterone, estradiol, and SHBG concentrations among non-Hispanic black, non-Hispanic white, and Mexican-American men. Previous studies comparing hormone levels by race might have been limited by size, restricted age variation, or lack of representation of the general population. Context: Higher testosterone in black compared with white men has been postulated to explain their higher prostate cancer incidence.
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